package com.mall.concurrency.example.atomic;

import com.mall.concurrency.annoations.ThreadSafe;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;

@Slf4j
@ThreadSafe
public class AtomicExample6 {
    private static AtomicBoolean isHappened =
            new AtomicBoolean(false);
    //请求总数
    private static int clientTotal = 5000;
    //同时并发执行得线程数量
    private static int threadTotal = 200;

    public static void main(String[] args) throws Exception{
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for(int i=0;i<clientTotal;i++){
            executorService.execute(()->{
                try {
                    semaphore.acquire();
                    test();
                    semaphore.release();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                countDownLatch.countDown();
            });

        }
        countDownLatch.await();

        executorService.shutdown();
        log.info("isHappend:{}",isHappened.get());
    }
    private static void test(){
        if(isHappened.compareAndSet(false,true)){
            log.info("execute");
        }
    }
}
